linux-kernel - Re: [RFC][PATCH 12/13] sched/deadline: Introduce deadline servers

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Date:   Thu, 8 Aug 2019 08:59:56 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        dietmar.eggemann@....com, luca.abeni@...tannapisa.it,
        bristot@...hat.com, balsini@...roid.com, dvyukov@...gle.com,
        tglx@...utronix.de, vpillai@...italocean.com, rostedt@...dmis.org
Subject: Re: [RFC][PATCH 12/13] sched/deadline: Introduce deadline servers

Hi,

On 26/07/19 16:54, Peter Zijlstra wrote:

[...]

> +void dl_server_init(struct sched_dl_entity *dl_se, struct rq *rq,
> +		    dl_server_has_tasks_f has_tasks,
> +		    dl_server_pick_f pick)
> +{
> +	dl_se->dl_server = 1;
> +	dl_se->rq = rq;
> +	dl_se->server_has_tasks = has_tasks;
> +	dl_se->server_pick = pick;
> +
> +	setup_new_dl_entity(dl_se);

I think we need to postpone calling setup_new_dl_entity() to when
dl_server_start() is called for the first time. rq_clock() needs both
a caller that holds rq lock (which we can add) and an updated clock
(which I'm not sure we can do at this point in time, or maybe we can
avoid/trick the debug check?).

Thanks,

Juri